Okay kiddo, have you ever seen those big plastic boxes that people use to store tools or toys in their garage? Well, a systainer is something like that, but it's designed specifically for tools and other stuff that you might need to take with you to different jobs or projects.
The systainer is made up of two main parts: a sturdy, stackable case and a removable insert tray. You can use the tray to organize and store different tools or items, and then secure it inside the case with latches or clips. This way, everything stays neat and organized and doesn't get all jumbled up during transport.
The really cool thing about the systainer is that it is designed to be interchangeable and compatible with a lot of different types of tools and equipment. So, if you have a bunch of different tools in different cases, you can actually stack them all on top of each other using a systainer base and lid. That way, you can easily take them all with you in one go, and then just remove the ones you need for your project.
Overall, a systainer is a great way to keep your tools and equipment organized and easily accessible, whether you're working on a big project or just need to take a few things with you on the go.